problem getting gintrospection to run

[grindhold]

although i got gintrospection to compile against a modern php7.0-environment,
i have problems executing the import_namespace.php example

PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib/php/20151012/gintrospection.so' - /usr/lib/php/20151012/gintrospection.so: undefined symbol: ce_glib_enum in Unknown on line 0
PHP Fatal error:  Uncaught Error: Class 'Gir\Repository' not found in /home/grindhold/phpgo/gintrospection/examples/import_namespace.php:4

i created ini-files for glib, gobject and gintrospection in the following fashion to ensure that they are being loaded in the right order:

20-glib.ini
21-gobject.ini
22-gintrospection.ini

Also the file /usr/include/php/buildnr/glib/php_glib_public.h exports the ce_glib_enum symbol. any idea what i am doing wrong? or are there more incompatibilities that I have to take into account with php7.0?